public void ResLoaderTest()
        {
            ResFactory.AddResCreator <TestResCreator>();

            // 测试
            var resLoader = ResLoader.Allocate();

            var resSearchKeys = ResSearchKeys.Allocate("test://icon_texture", null, typeof(Texture2D));

            var iconTextureRes = resLoader.LoadResSync(resSearchKeys);

            Assert.IsTrue(iconTextureRes is TestRes);
            Assert.AreEqual(1, iconTextureRes.RefCount);
            Assert.AreEqual(ResState.Ready, iconTextureRes.State);

            resLoader.Recycle2Cache();

            Assert.AreEqual(0, iconTextureRes.RefCount);
            Assert.AreEqual(ResState.Waiting, iconTextureRes.State);

            resLoader = null;
        }